1,180 research outputs found
Colin Humphris
No full text"Colin Humphris 2 Sqdrn. RAAF. 1941 - 1942 Author of - 'Trapped on Timor' (as a result of bombing of Darwin Feb. 19, 1942)".Colin Humphris. 2 Squadron, Royal Australian Air Force 1941 - 1942. Author of - 'Trapped on Timor' (as a result of bombing of Darwin February 19, 1942)
Orbit design for future SpaceChip swarm missions in a planetary atmosphere
No full textThe effect of solar radiation pressure and atmospheric drag on the orbital dynamics of satellites-on-a-chip (SpaceChips) is exploited to design equatorial long-lived orbits about the oblate Earth. The orbit energy gain due to asymmetric solar radiation pressure, considering the Earth's shadow, is used to balance the energy loss due to atmospheric drag. Future missions for a swarm of SpaceChips are proposed, where a number of small devices are released from a conventional spacecraft to perform spatially distributed measurements of the conditions in the ionosphere and exosphere. It is shown that the orbit lifetime can be extended and indeed selected through solar radiation pressure and the end-of-life re-entry of the swarm can be ensured, by exploiting atmospheric drag
Enumeration of Stack-Sorting Preimages via a Decomposition Lemma
No full textWe give three applications of a recently-proven "Decomposition Lemma," which
allows one to count preimages of certain sets of permutations under West's
stack-sorting map . We first enumerate the permutation class
, finding a new example
of an unbalanced Wilf equivalence. This result is equivalent to the enumeration
of permutations sortable by , where is the bubble
sort map. We then prove that the sets ,
,
and are
counted by the so-called "Boolean-Catalan numbers," settling a conjecture of
the current author and another conjecture of Hossain. This completes the
enumerations of all sets of the form
for
with the exception of the set
. We also find an explicit formula for
, where
is the set of permutations in with descents.
This allows us to prove a conjectured identity involving Catalan numbers and
order ideals in Young's lattice
Reverse engineering of 3D-BIM of existing infrastructure using parametric tooling to accelerate the digitization transition in asset management: A research & development study by Colin Reit
No full textAmid global climate change challenges, the construction industry faces an urgent transition from a linear production model to a Circular Economy (CE). Initiatives and recommendations in Dutch transition roadmaps and literature predominantly focus on ensuring a future circular built environment, while lacking concrete actions on leveraging the existing assets for reuse. Dutch CE roadmap timelines and interventions are developed based on Material Flow Analysis (MFA) studies with highly uncertain data input, this uncertainty impacts either environment or economy with inaccurate interventions on the CE-transition. Secondly, the Replacement & Renovation (R&R) task of civil structures poses a threat for the industry due to the limitations of capital, contractor capacity, and material resources required to facilitate this peak. There is currently a lack of centrally stored high-quality physical asset data available at public organisations. This data is essential in effectively managing the decommissioning peak and reduces risk for reuse realization. Lastly, Asset Management (AM) is transitioning towards a 3D-centralised strategy in line with Building Information Modelling (BIM) and digital twins, while existing assets are still in 2D with often incomplete and fragmented data documentation. Consequently, a large data quality gap is forming between new and existing assets. This led to the research question: How can centrally stored, quantified, and visualised asset data of existing infrastructure impact the CE-transition, bridge R&R-task efficiency, and AM practices? An upgrade towards 3D-BIM is required for existing assets to bridge this data gap. In doing so, facilitate higher quality- and more accessible asset specific information that can be used in reusability scanning and structural assessments, material quantification for CE-transition roadmap accuracy, and numerous AM benefits. The costs for upgrading the existing assets using manual modelling or 3D scanning technology are currently too large to justify. An opportunity was identified for modelling 3D-BIM of existing beam & slab bridges from 2D drawings using a modular approach to Parametric Engineering, aiming to reduce the investment threshold, and accelerating the digitization transition. Preliminary testing executed by the author showed a potential for 50-80% reduction in modelling efforts compared to conventional modelling practices with a volume accuracy of >97%. The prototype calls for further development, validation, and similar efforts for other infrastructure types. The tool also showed potential for 3D structural & reusability assessments, reinforcement approx., and ptioneering & circularity scoring for the design phase. To put the tool’s use in perspective, a roadmap towards 3D centralized AM and a reuse economy was developed for AM. Civil Engineering | Construction Management and Engineerin
Second malignancies in breast cancer patients following radiotherapy: a study in Florence, Italy
Get PDFntroduction: Patients diagnosed with breast cancer are often treated with surgery followed by radiation therapy. In this paper, we evaluate the effect that radiotherapy may have had on the subsequent risk of second malignancies, including the possible influences of age at treatment and menopausal status.Methods: In order to evaluate the long-term consequences of radiotherapy, a cohort study was conducted based on clinical records for 5,248 women treated for breast cancer in Florence (Italy), with continuous follow-up from 1965 to 1994. The Cox proportional hazards model for ungrouped survival data was used to estimate the relative risk for second cancer after radiotherapy.Results: This study indicated an increased relative risk of all second cancers combined following radiotherapy (1.22, 95% CI: 0.88 to 1.69). The increased relative risk appeared five or more years after radiotherapy and appeared to be highest amongst women treated after the menopause (1.61, 95% CI: 1.13 to 2.29). Increased relative risks were observed specifically for leukaemia (8.13, 95% CI: 0.96 to 69.1) and other solid cancers (1.84, 95% CI: 1.06 to 3.16), excluding contralateral breast cancer. For contralateral breast cancer, no raised relative risk was observed during the period more than five years after radiotherapy.Conclusions: The study indicated a raised risk of second malignancies associated with radiotherapy for breast cancer, particularly for women treated after the menopause
Application of the Potthoff-Whittinghill technique to detecting temporal clustering of influenza hospitalisations among children aged 0–4 years in California<sup>a</sup> during the flu seasons from 2006–07 to 2011–12 inclusive.
No full text<p>Notes:</p><p>Based on locations participating in the California Emerging Infections Program.</p>a<p>PW is the one-step estimate of β, the extra-Poisson variation, calculated as S/i(0) in the notation of Muirhead <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060489#pone.0060489-Muirhead1" target="_blank">[22]</a>.</p>b<p>SE is the standard error of PW in the absence of extra-Poisson variation, calculated as 1/√i(0) in the notation of Muirhead <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060489#pone.0060489-Muirhead1" target="_blank">[22]</a>.</p>c<p>p-values have been calculated using 10000 simulations of PW, assuming Poisson variation. All p-values are one-sided.</p
Longitudinal train dynamics and vehicle stability in train operations
No full textCole, CR ORCiD: 0000-0001-8840-7136This chapter has been designed to provide a hands-on guide to both understanding and analysing longitudinal train dynamics. It is specifically focussed on the longitudinal dynamics of heavy-haul trains and adds new insights to previous work by the author [1–4], along with recent modelling
work relevant to passenger trains [5]. It is 12 years since the first edition and the draft gear section is now expanded. New to the chapter is material concerning lateral wagon stability in the presence of lateral coupler force components. Passenger comfort and crashworthiness sections are also updated
Application of the Potthoff-Whittinghill technique to detecting temporal clustering of diagnoses of type 1 diabetes at ages 0–14 years in Northumberland, Newcastle upon Tyne and North Tyneside during 1990–2007 inclusive.
No full text<p>Notes:</p>a<p>PW is the one-step estimate of β, the extra-Poisson variation, calculated as S/i(0) in the notation of Muirhead <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060489#pone.0060489-Muirhead1" target="_blank">[22]</a>.</p>b<p>SE is the standard error of PW in the absence of extra-Poisson variation, calculated as 1/√i(0) in the notation of Muirhead <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060489#pone.0060489-Muirhead1" target="_blank">[22]</a>.</p>c<p>p-values have been calculated using 10000 simulations of PW, assuming Poisson variation. All p-values are one-sided.</p>d<p>The analysis between years was based on all 526 cases, whereas the other analyses excluded the 58 cases with a diagnosis date of 1<sup>st</sup> July.</p
Oregon statewide status and trends report
No full textReport -- Appendix A. Black Rock Desert-Humboldt -- Appendix B. Columbia River -- Appendix C. Deschutes -- Appendix D. Goose Lake -- Appendix E. Grande Ronde -- Appendix F. John Day -- Appendix G. Klamath -- Appendix H. Malheur -- Appendix I. Mid Coast -- Appendix J. Middle-Columbia-Hood -- Appendix K. North Coast-Lower Columbia -- Appendix L. Oregon Closed Basins -- Appendix M. Owyhee -- Appendix N. Powder-Burnt -- Appendix O. Rogue -- Appendix P. Sandy -- Appendix Q. Snake River -- Appendix R. South Coast -- Appendix S. Umatilla-Walla Walla-Willow -- Appendix T. Umpqua -- Appendix U. Willamette.prepared by: Colin Donald and Ryan Michie.Title from PDF cover (viewed on November 4, 2022).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Oregon statewide status and trends report
No full textChapter 1-3. Introduction and Methods -- Chapter 4-5. Results and Citations -- Appendix A. Black Rock Desert-Humboldt -- Appendix B. Columbia River -- Appendix C. Deschutes -- Appendix D. Goose Lake -- Appendix E. Grande Ronde -- Appendix F. John Day -- Appendix G. Klamath -- Appendix H. Malheur -- Appendix I. Mid Coast -- Appendix J. Middle-Columbia-Hood -- Appendix K. North Coast-Lower Columbia -- Appendix L. Oregon Closed Basins -- Appendix M. Owyhee -- Appendix N. Powder-Burnt -- Appendix O. Rogue -- Appendix P. Sandy -- Appendix Q. Snake River -- Appendix R. South Coast -- Appendix S. Umatilla-Walla Walla-Willow -- Appendix T. Umpqua -- Appendix U. Willamette.prepared by: Colin Donald, Yuan Grund, and Ryan Michie.Title from PDF cover (viewed on October 27, 2020).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
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